Formerly the Grand-Am Cup Series, the KONI Challenge is the premier proving ground for many of today’s automotive manufacturers. The series competes at historic tracks in the United States and Canada, featuring some of the best production car drivers from around the world. The series complements the Rolex Sports Car Series by using race cars that are actual production cars. Similar to the Rolex Series GT cars in appearance, KONI Challenge cars are straight off the showroom floor with only minimal racing modifications to enhance safety and performance.

Four classes of race cars compete on the track at the same time during KONI Challenge events, with drivers competing for top honors in their specified class, as well as the overall win. KONI Challenge cars classified by weight, engine size and model.